Merge tag 'for-linus-20170825' of git://git.infradead.org/linux-mtd

[mirror_ubuntu-artful-kernel.git] / drivers / infiniband / hw / mlx4 / cq.c

/*
 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/mlx4/cq.h>
#include <linux/mlx4/qp.h>
#include <linux/mlx4/srq.h>
#include <linux/slab.h>

#include "mlx4_ib.h"
#include <rdma/mlx4-abi.h>

static void mlx4_ib_cq_comp(struct mlx4_cq *cq)
{
        struct ib_cq *ibcq = &to_mibcq(cq)->ibcq;
        ibcq->comp_handler(ibcq, ibcq->cq_context);
}

static void mlx4_ib_cq_event(struct mlx4_cq *cq, enum mlx4_event type)
{
        struct ib_event event;
        struct ib_cq *ibcq;

        if (type != MLX4_EVENT_TYPE_CQ_ERROR) {
                pr_warn("Unexpected event type %d "
                       "on CQ %06x\n", type, cq->cqn);
                return;
        }

        ibcq = &to_mibcq(cq)->ibcq;
        if (ibcq->event_handler) {
                event.device     = ibcq->device;
                event.event      = IB_EVENT_CQ_ERR;
                event.element.cq = ibcq;
                ibcq->event_handler(&event, ibcq->cq_context);
        }
}

static void *get_cqe_from_buf(struct mlx4_ib_cq_buf *buf, int n)
{
        return mlx4_buf_offset(&buf->buf, n * buf->entry_size);
}

static void *get_cqe(struct mlx4_ib_cq *cq, int n)
{
        return get_cqe_from_buf(&cq->buf, n);
}

static void *get_sw_cqe(struct mlx4_ib_cq *cq, int n)
{
        struct mlx4_cqe *cqe = get_cqe(cq, n & cq->ibcq.cqe);
        struct mlx4_cqe *tcqe = ((cq->buf.entry_size == 64) ? (cqe + 1) : cqe);

        return (!!(tcqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK) ^
                !!(n & (cq->ibcq.cqe + 1))) ? NULL : cqe;
}

static struct mlx4_cqe *next_cqe_sw(struct mlx4_ib_cq *cq)
{
        return get_sw_cqe(cq, cq->mcq.cons_index);
}

int mlx4_ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
{
        struct mlx4_ib_cq *mcq = to_mcq(cq);
        struct mlx4_ib_dev *dev = to_mdev(cq->device);

        return mlx4_cq_modify(dev->dev, &mcq->mcq, cq_count, cq_period);
}

static int mlx4_ib_alloc_cq_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq_buf *buf, int nent)
{
        int err;

        err = mlx4_buf_alloc(dev->dev, nent * dev->dev->caps.cqe_size,
                             PAGE_SIZE * 2, &buf->buf);

        if (err)
                goto out;

        buf->entry_size = dev->dev->caps.cqe_size;
        err = mlx4_mtt_init(dev->dev, buf->buf.npages, buf->buf.page_shift,
                                    &buf->mtt);
        if (err)
                goto err_buf;

        err = mlx4_buf_write_mtt(dev->dev, &buf->mtt, &buf->buf);
        if (err)
                goto err_mtt;

        return 0;

err_mtt:
        mlx4_mtt_cleanup(dev->dev, &buf->mtt);

err_buf:
        mlx4_buf_free(dev->dev, nent * buf->entry_size, &buf->buf);

out:
        return err;
}

static void mlx4_ib_free_cq_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq_buf *buf, int cqe)
{
        mlx4_buf_free(dev->dev, (cqe + 1) * buf->entry_size, &buf->buf);
}

static int mlx4_ib_get_cq_umem(struct mlx4_ib_dev *dev, struct ib_ucontext *context,
                               struct mlx4_ib_cq_buf *buf, struct ib_umem **umem,
                               u64 buf_addr, int cqe)
{
        int err;
        int cqe_size = dev->dev->caps.cqe_size;

        *umem = ib_umem_get(context, buf_addr, cqe * cqe_size,
                            IB_ACCESS_LOCAL_WRITE, 1);
        if (IS_ERR(*umem))
                return PTR_ERR(*umem);

        err = mlx4_mtt_init(dev->dev, ib_umem_page_count(*umem),
                            (*umem)->page_shift, &buf->mtt);
        if (err)
                goto err_buf;

        err = mlx4_ib_umem_write_mtt(dev, &buf->mtt, *umem);
        if (err)
                goto err_mtt;

        return 0;

err_mtt:
        mlx4_mtt_cleanup(dev->dev, &buf->mtt);

err_buf:
        ib_umem_release(*umem);

        return err;
}

#define CQ_CREATE_FLAGS_SUPPORTED IB_CQ_FLAGS_TIMESTAMP_COMPLETION
struct ib_cq *mlx4_ib_create_cq(struct ib_device *ibdev,
                                const struct ib_cq_init_attr *attr,
                                struct ib_ucontext *context,
                                struct ib_udata *udata)
{
        int entries = attr->cqe;
        int vector = attr->comp_vector;
        struct mlx4_ib_dev *dev = to_mdev(ibdev);
        struct mlx4_ib_cq *cq;
        struct mlx4_uar *uar;
        int err;

        if (entries < 1 || entries > dev->dev->caps.max_cqes)
                return ERR_PTR(-EINVAL);

        if (attr->flags & ~CQ_CREATE_FLAGS_SUPPORTED)
                return ERR_PTR(-EINVAL);

        cq = kmalloc(sizeof *cq, GFP_KERNEL);
        if (!cq)
                return ERR_PTR(-ENOMEM);

        entries      = roundup_pow_of_two(entries + 1);
        cq->ibcq.cqe = entries - 1;
        mutex_init(&cq->resize_mutex);
        spin_lock_init(&cq->lock);
        cq->resize_buf = NULL;
        cq->resize_umem = NULL;
        cq->create_flags = attr->flags;
        INIT_LIST_HEAD(&cq->send_qp_list);
        INIT_LIST_HEAD(&cq->recv_qp_list);

        if (context) {
                struct mlx4_ib_create_cq ucmd;

                if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
                        err = -EFAULT;
                        goto err_cq;
                }

                err = mlx4_ib_get_cq_umem(dev, context, &cq->buf, &cq->umem,
                                          ucmd.buf_addr, entries);
                if (err)
                        goto err_cq;

                err = mlx4_ib_db_map_user(to_mucontext(context), ucmd.db_addr,
                                          &cq->db);
                if (err)
                        goto err_mtt;

                uar = &to_mucontext(context)->uar;
        } else {
                err = mlx4_db_alloc(dev->dev, &cq->db, 1);
                if (err)
                        goto err_cq;

                cq->mcq.set_ci_db  = cq->db.db;
                cq->mcq.arm_db     = cq->db.db + 1;
                *cq->mcq.set_ci_db = 0;
                *cq->mcq.arm_db    = 0;

                err = mlx4_ib_alloc_cq_buf(dev, &cq->buf, entries);
                if (err)
                        goto err_db;

                uar = &dev->priv_uar;
        }

        if (dev->eq_table)
                vector = dev->eq_table[vector % ibdev->num_comp_vectors];

        err = mlx4_cq_alloc(dev->dev, entries, &cq->buf.mtt, uar,
                            cq->db.dma, &cq->mcq, vector, 0,
                            !!(cq->create_flags & IB_CQ_FLAGS_TIMESTAMP_COMPLETION));
        if (err)
                goto err_dbmap;

        if (context)
                cq->mcq.tasklet_ctx.comp = mlx4_ib_cq_comp;
        else
                cq->mcq.comp = mlx4_ib_cq_comp;
        cq->mcq.event = mlx4_ib_cq_event;

        if (context)
                if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof (__u32))) {
                        err = -EFAULT;
                        goto err_cq_free;
                }

        return &cq->ibcq;

err_cq_free:
        mlx4_cq_free(dev->dev, &cq->mcq);

err_dbmap:
        if (context)
                mlx4_ib_db_unmap_user(to_mucontext(context), &cq->db);

err_mtt:
        mlx4_mtt_cleanup(dev->dev, &cq->buf.mtt);

        if (context)
                ib_umem_release(cq->umem);
        else
                mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);

err_db:
        if (!context)
                mlx4_db_free(dev->dev, &cq->db);

err_cq:
        kfree(cq);

        return ERR_PTR(err);
}

static int mlx4_alloc_resize_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
                                  int entries)
{
        int err;

        if (cq->resize_buf)
                return -EBUSY;

        cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_KERNEL);
        if (!cq->resize_buf)
                return -ENOMEM;

        err = mlx4_ib_alloc_cq_buf(dev, &cq->resize_buf->buf, entries);
        if (err) {
                kfree(cq->resize_buf);
                cq->resize_buf = NULL;
                return err;
        }

        cq->resize_buf->cqe = entries - 1;

        return 0;
}

static int mlx4_alloc_resize_umem(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
                                   int entries, struct ib_udata *udata)
{
        struct mlx4_ib_resize_cq ucmd;
        int err;

        if (cq->resize_umem)
                return -EBUSY;

        if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd))
                return -EFAULT;

        cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_KERNEL);
        if (!cq->resize_buf)
                return -ENOMEM;

        err = mlx4_ib_get_cq_umem(dev, cq->umem->context, &cq->resize_buf->buf,
                                  &cq->resize_umem, ucmd.buf_addr, entries);
        if (err) {
                kfree(cq->resize_buf);
                cq->resize_buf = NULL;
                return err;
        }

        cq->resize_buf->cqe = entries - 1;

        return 0;
}

static int mlx4_ib_get_outstanding_cqes(struct mlx4_ib_cq *cq)
{
        u32 i;

        i = cq->mcq.cons_index;
        while (get_sw_cqe(cq, i))
                ++i;

        return i - cq->mcq.cons_index;
}

static void mlx4_ib_cq_resize_copy_cqes(struct mlx4_ib_cq *cq)
{
        struct mlx4_cqe *cqe, *new_cqe;
        int i;
        int cqe_size = cq->buf.entry_size;
        int cqe_inc = cqe_size == 64 ? 1 : 0;

        i = cq->mcq.cons_index;
        cqe = get_cqe(cq, i & cq->ibcq.cqe);
        cqe += cqe_inc;

        while ((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) != MLX4_CQE_OPCODE_RESIZE) {
                new_cqe = get_cqe_from_buf(&cq->resize_buf->buf,
                                           (i + 1) & cq->resize_buf->cqe);
                memcpy(new_cqe, get_cqe(cq, i & cq->ibcq.cqe), cqe_size);
                new_cqe += cqe_inc;

                new_cqe->owner_sr_opcode = (cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK) |
                        (((i + 1) & (cq->resize_buf->cqe + 1)) ? MLX4_CQE_OWNER_MASK : 0);
                cqe = get_cqe(cq, ++i & cq->ibcq.cqe);
                cqe += cqe_inc;
        }
        ++cq->mcq.cons_index;
}

int mlx4_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
{
        struct mlx4_ib_dev *dev = to_mdev(ibcq->device);
        struct mlx4_ib_cq *cq = to_mcq(ibcq);
        struct mlx4_mtt mtt;
        int outst_cqe;
        int err;

        mutex_lock(&cq->resize_mutex);
        if (entries < 1 || entries > dev->dev->caps.max_cqes) {
                err = -EINVAL;
                goto out;
        }

        entries = roundup_pow_of_two(entries + 1);
        if (entries == ibcq->cqe + 1) {
                err = 0;
                goto out;
        }

        if (entries > dev->dev->caps.max_cqes + 1) {
                err = -EINVAL;
                goto out;
        }

        if (ibcq->uobject) {
                err = mlx4_alloc_resize_umem(dev, cq, entries, udata);
                if (err)
                        goto out;
        } else {
                /* Can't be smaller than the number of outstanding CQEs */
                outst_cqe = mlx4_ib_get_outstanding_cqes(cq);
                if (entries < outst_cqe + 1) {
                        err = -EINVAL;
                        goto out;
                }

                err = mlx4_alloc_resize_buf(dev, cq, entries);
                if (err)
                        goto out;
        }

        mtt = cq->buf.mtt;

        err = mlx4_cq_resize(dev->dev, &cq->mcq, entries, &cq->resize_buf->buf.mtt);
        if (err)
                goto err_buf;

        mlx4_mtt_cleanup(dev->dev, &mtt);
        if (ibcq->uobject) {
                cq->buf      = cq->resize_buf->buf;
                cq->ibcq.cqe = cq->resize_buf->cqe;
                ib_umem_release(cq->umem);
                cq->umem     = cq->resize_umem;

                kfree(cq->resize_buf);
                cq->resize_buf = NULL;
                cq->resize_umem = NULL;
        } else {
                struct mlx4_ib_cq_buf tmp_buf;
                int tmp_cqe = 0;

                spin_lock_irq(&cq->lock);
                if (cq->resize_buf) {
                        mlx4_ib_cq_resize_copy_cqes(cq);
                        tmp_buf = cq->buf;
                        tmp_cqe = cq->ibcq.cqe;
                        cq->buf      = cq->resize_buf->buf;
                        cq->ibcq.cqe = cq->resize_buf->cqe;

                        kfree(cq->resize_buf);
                        cq->resize_buf = NULL;
                }
                spin_unlock_irq(&cq->lock);

                if (tmp_cqe)
                        mlx4_ib_free_cq_buf(dev, &tmp_buf, tmp_cqe);
        }

        goto out;

err_buf:
        mlx4_mtt_cleanup(dev->dev, &cq->resize_buf->buf.mtt);
        if (!ibcq->uobject)
                mlx4_ib_free_cq_buf(dev, &cq->resize_buf->buf,
                                    cq->resize_buf->cqe);

        kfree(cq->resize_buf);
        cq->resize_buf = NULL;

        if (cq->resize_umem) {
                ib_umem_release(cq->resize_umem);
                cq->resize_umem = NULL;
        }

out:
        mutex_unlock(&cq->resize_mutex);

        return err;
}

int mlx4_ib_destroy_cq(struct ib_cq *cq)
{
        struct mlx4_ib_dev *dev = to_mdev(cq->device);
        struct mlx4_ib_cq *mcq = to_mcq(cq);

        mlx4_cq_free(dev->dev, &mcq->mcq);
        mlx4_mtt_cleanup(dev->dev, &mcq->buf.mtt);

        if (cq->uobject) {
                mlx4_ib_db_unmap_user(to_mucontext(cq->uobject->context), &mcq->db);
                ib_umem_release(mcq->umem);
        } else {
                mlx4_ib_free_cq_buf(dev, &mcq->buf, cq->cqe);
                mlx4_db_free(dev->dev, &mcq->db);
        }

        kfree(mcq);

        return 0;
}

static void dump_cqe(void *cqe)
{
        __be32 *buf = cqe;

        pr_debug("CQE contents %08x %08x %08x %08x %08x %08x %08x %08x\n",
               be32_to_cpu(buf[0]), be32_to_cpu(buf[1]), be32_to_cpu(buf[2]),
               be32_to_cpu(buf[3]), be32_to_cpu(buf[4]), be32_to_cpu(buf[5]),
               be32_to_cpu(buf[6]), be32_to_cpu(buf[7]));
}

static void mlx4_ib_handle_error_cqe(struct mlx4_err_cqe *cqe,
                                     struct ib_wc *wc)
{
        if (cqe->syndrome == MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR) {
                pr_debug("local QP operation err "
                       "(QPN %06x, WQE index %x, vendor syndrome %02x, "
                       "opcode = %02x)\n",
                       be32_to_cpu(cqe->my_qpn), be16_to_cpu(cqe->wqe_index),
                       cqe->vendor_err_syndrome,
                       cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
                dump_cqe(cqe);
        }

        switch (cqe->syndrome) {
        case MLX4_CQE_SYNDROME_LOCAL_LENGTH_ERR:
                wc->status = IB_WC_LOC_LEN_ERR;
                break;
        case MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR:
                wc->status = IB_WC_LOC_QP_OP_ERR;
                break;
        case MLX4_CQE_SYNDROME_LOCAL_PROT_ERR:
                wc->status = IB_WC_LOC_PROT_ERR;
                break;
        case MLX4_CQE_SYNDROME_WR_FLUSH_ERR:
                wc->status = IB_WC_WR_FLUSH_ERR;
                break;
        case MLX4_CQE_SYNDROME_MW_BIND_ERR:
                wc->status = IB_WC_MW_BIND_ERR;
                break;
        case MLX4_CQE_SYNDROME_BAD_RESP_ERR:
                wc->status = IB_WC_BAD_RESP_ERR;
                break;
        case MLX4_CQE_SYNDROME_LOCAL_ACCESS_ERR:
                wc->status = IB_WC_LOC_ACCESS_ERR;
                break;
        case MLX4_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR:
                wc->status = IB_WC_REM_INV_REQ_ERR;
                break;
        case MLX4_CQE_SYNDROME_REMOTE_ACCESS_ERR:
                wc->status = IB_WC_REM_ACCESS_ERR;
                break;
        case MLX4_CQE_SYNDROME_REMOTE_OP_ERR:
                wc->status = IB_WC_REM_OP_ERR;
                break;
        case MLX4_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR:
                wc->status = IB_WC_RETRY_EXC_ERR;
                break;
        case MLX4_CQE_SYNDROME_RNR_RETRY_EXC_ERR:
                wc->status = IB_WC_RNR_RETRY_EXC_ERR;
                break;
        case MLX4_CQE_SYNDROME_REMOTE_ABORTED_ERR:
                wc->status = IB_WC_REM_ABORT_ERR;
                break;
        default:
                wc->status = IB_WC_GENERAL_ERR;
                break;
        }

        wc->vendor_err = cqe->vendor_err_syndrome;
}

static int mlx4_ib_ipoib_csum_ok(__be16 status, __be16 checksum)
{
        return ((status & cpu_to_be16(MLX4_CQE_STATUS_IPV4      |
                                      MLX4_CQE_STATUS_IPV4F     |
                                      MLX4_CQE_STATUS_IPV4OPT   |
                                      MLX4_CQE_STATUS_IPV6      |
                                      MLX4_CQE_STATUS_IPOK)) ==
                cpu_to_be16(MLX4_CQE_STATUS_IPV4        |
                            MLX4_CQE_STATUS_IPOK))              &&
                (status & cpu_to_be16(MLX4_CQE_STATUS_UDP       |
                                      MLX4_CQE_STATUS_TCP))     &&
                checksum == cpu_to_be16(0xffff);
}

static void use_tunnel_data(struct mlx4_ib_qp *qp, struct mlx4_ib_cq *cq, struct ib_wc *wc,
                            unsigned tail, struct mlx4_cqe *cqe, int is_eth)
{
        struct mlx4_ib_proxy_sqp_hdr *hdr;

        ib_dma_sync_single_for_cpu(qp->ibqp.device,
                                   qp->sqp_proxy_rcv[tail].map,
                                   sizeof (struct mlx4_ib_proxy_sqp_hdr),
                                   DMA_FROM_DEVICE);
        hdr = (struct mlx4_ib_proxy_sqp_hdr *) (qp->sqp_proxy_rcv[tail].addr);
        wc->pkey_index  = be16_to_cpu(hdr->tun.pkey_index);
        wc->src_qp      = be32_to_cpu(hdr->tun.flags_src_qp) & 0xFFFFFF;
        wc->wc_flags   |= (hdr->tun.g_ml_path & 0x80) ? (IB_WC_GRH) : 0;
        wc->dlid_path_bits = 0;

        if (is_eth) {
                wc->vlan_id = be16_to_cpu(hdr->tun.sl_vid);
                memcpy(&(wc->smac[0]), (char *)&hdr->tun.mac_31_0, 4);
                memcpy(&(wc->smac[4]), (char *)&hdr->tun.slid_mac_47_32, 2);
                wc->wc_flags |= (IB_WC_WITH_VLAN | IB_WC_WITH_SMAC);
        } else {
                wc->slid        = be16_to_cpu(hdr->tun.slid_mac_47_32);
                wc->sl          = (u8) (be16_to_cpu(hdr->tun.sl_vid) >> 12);
        }
}

static void mlx4_ib_qp_sw_comp(struct mlx4_ib_qp *qp, int num_entries,
                               struct ib_wc *wc, int *npolled, int is_send)
{
        struct mlx4_ib_wq *wq;
        unsigned cur;
        int i;

        wq = is_send ? &qp->sq : &qp->rq;
        cur = wq->head - wq->tail;

        if (cur == 0)
                return;

        for (i = 0;  i < cur && *npolled < num_entries; i++) {
                wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
                wc->status = IB_WC_WR_FLUSH_ERR;
                wc->vendor_err = MLX4_CQE_SYNDROME_WR_FLUSH_ERR;
                wq->tail++;
                (*npolled)++;
                wc->qp = &qp->ibqp;
                wc++;
        }
}

static void mlx4_ib_poll_sw_comp(struct mlx4_ib_cq *cq, int num_entries,
                                 struct ib_wc *wc, int *npolled)
{
        struct mlx4_ib_qp *qp;

        *npolled = 0;
        /* Find uncompleted WQEs belonging to that cq and retrun
         * simulated FLUSH_ERR completions
         */
        list_for_each_entry(qp, &cq->send_qp_list, cq_send_list) {
                mlx4_ib_qp_sw_comp(qp, num_entries, wc + *npolled, npolled, 1);
                if (*npolled >= num_entries)
                        goto out;
        }

        list_for_each_entry(qp, &cq->recv_qp_list, cq_recv_list) {
                mlx4_ib_qp_sw_comp(qp, num_entries, wc + *npolled, npolled, 0);
                if (*npolled >= num_entries)
                        goto out;
        }

out:
        return;
}

static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
                            struct mlx4_ib_qp **cur_qp,
                            struct ib_wc *wc)
{
        struct mlx4_cqe *cqe;
        struct mlx4_qp *mqp;
        struct mlx4_ib_wq *wq;
        struct mlx4_ib_srq *srq;
        struct mlx4_srq *msrq = NULL;
        int is_send;
        int is_error;
        int is_eth;
        u32 g_mlpath_rqpn;
        u16 wqe_ctr;
        unsigned tail = 0;

repoll:
        cqe = next_cqe_sw(cq);
        if (!cqe)
                return -EAGAIN;

        if (cq->buf.entry_size == 64)
                cqe++;

        ++cq->mcq.cons_index;

        /*
         * Make sure we read CQ entry contents after we've checked the
         * ownership bit.
         */
        rmb();

        is_send  = cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK;
        is_error = (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
                MLX4_CQE_OPCODE_ERROR;

        /* Resize CQ in progress */
        if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_CQE_OPCODE_RESIZE)) {
                if (cq->resize_buf) {
                        struct mlx4_ib_dev *dev = to_mdev(cq->ibcq.device);

                        mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
                        cq->buf      = cq->resize_buf->buf;
                        cq->ibcq.cqe = cq->resize_buf->cqe;

                        kfree(cq->resize_buf);
                        cq->resize_buf = NULL;
                }

                goto repoll;
        }

        if (!*cur_qp ||
            (be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK) != (*cur_qp)->mqp.qpn) {
                /*
                 * We do not have to take the QP table lock here,
                 * because CQs will be locked while QPs are removed
                 * from the table.
                 */
                mqp = __mlx4_qp_lookup(to_mdev(cq->ibcq.device)->dev,
                                       be32_to_cpu(cqe->vlan_my_qpn));
                *cur_qp = to_mibqp(mqp);
        }

        wc->qp = &(*cur_qp)->ibqp;

        if (wc->qp->qp_type == IB_QPT_XRC_TGT) {
                u32 srq_num;
                g_mlpath_rqpn = be32_to_cpu(cqe->g_mlpath_rqpn);
                srq_num       = g_mlpath_rqpn & 0xffffff;
                /* SRQ is also in the radix tree */
                msrq = mlx4_srq_lookup(to_mdev(cq->ibcq.device)->dev,
                                       srq_num);
        }

        if (is_send) {
                wq = &(*cur_qp)->sq;
                if (!(*cur_qp)->sq_signal_bits) {
                        wqe_ctr = be16_to_cpu(cqe->wqe_index);
                        wq->tail += (u16) (wqe_ctr - (u16) wq->tail);
                }
                wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
                ++wq->tail;
        } else if ((*cur_qp)->ibqp.srq) {
                srq = to_msrq((*cur_qp)->ibqp.srq);
                wqe_ctr = be16_to_cpu(cqe->wqe_index);
                wc->wr_id = srq->wrid[wqe_ctr];
                mlx4_ib_free_srq_wqe(srq, wqe_ctr);
        } else if (msrq) {
                srq = to_mibsrq(msrq);
                wqe_ctr = be16_to_cpu(cqe->wqe_index);
                wc->wr_id = srq->wrid[wqe_ctr];
                mlx4_ib_free_srq_wqe(srq, wqe_ctr);
        } else {
                wq        = &(*cur_qp)->rq;
                tail      = wq->tail & (wq->wqe_cnt - 1);
                wc->wr_id = wq->wrid[tail];
                ++wq->tail;
        }

        if (unlikely(is_error)) {
                mlx4_ib_handle_error_cqe((struct mlx4_err_cqe *) cqe, wc);
                return 0;
        }

        wc->status = IB_WC_SUCCESS;

        if (is_send) {
                wc->wc_flags = 0;
                switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
                case MLX4_OPCODE_RDMA_WRITE_IMM:
                        wc->wc_flags |= IB_WC_WITH_IMM;
                case MLX4_OPCODE_RDMA_WRITE:
                        wc->opcode    = IB_WC_RDMA_WRITE;
                        break;
                case MLX4_OPCODE_SEND_IMM:
                        wc->wc_flags |= IB_WC_WITH_IMM;
                case MLX4_OPCODE_SEND:
                case MLX4_OPCODE_SEND_INVAL:
                        wc->opcode    = IB_WC_SEND;
                        break;
                case MLX4_OPCODE_RDMA_READ:
                        wc->opcode    = IB_WC_RDMA_READ;
                        wc->byte_len  = be32_to_cpu(cqe->byte_cnt);
                        break;
                case MLX4_OPCODE_ATOMIC_CS:
                        wc->opcode    = IB_WC_COMP_SWAP;
                        wc->byte_len  = 8;
                        break;
                case MLX4_OPCODE_ATOMIC_FA:
                        wc->opcode    = IB_WC_FETCH_ADD;
                        wc->byte_len  = 8;
                        break;
                case MLX4_OPCODE_MASKED_ATOMIC_CS:
                        wc->opcode    = IB_WC_MASKED_COMP_SWAP;
                        wc->byte_len  = 8;
                        break;
                case MLX4_OPCODE_MASKED_ATOMIC_FA:
                        wc->opcode    = IB_WC_MASKED_FETCH_ADD;
                        wc->byte_len  = 8;
                        break;
                case MLX4_OPCODE_LSO:
                        wc->opcode    = IB_WC_LSO;
                        break;
                case MLX4_OPCODE_FMR:
                        wc->opcode    = IB_WC_REG_MR;
                        break;
                case MLX4_OPCODE_LOCAL_INVAL:
                        wc->opcode    = IB_WC_LOCAL_INV;
                        break;
                }
        } else {
                wc->byte_len = be32_to_cpu(cqe->byte_cnt);

                switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
                case MLX4_RECV_OPCODE_RDMA_WRITE_IMM:
                        wc->opcode      = IB_WC_RECV_RDMA_WITH_IMM;
                        wc->wc_flags    = IB_WC_WITH_IMM;
                        wc->ex.imm_data = cqe->immed_rss_invalid;
                        break;
                case MLX4_RECV_OPCODE_SEND_INVAL:
                        wc->opcode      = IB_WC_RECV;
                        wc->wc_flags    = IB_WC_WITH_INVALIDATE;
                        wc->ex.invalidate_rkey = be32_to_cpu(cqe->immed_rss_invalid);
                        break;
                case MLX4_RECV_OPCODE_SEND:
                        wc->opcode   = IB_WC_RECV;
                        wc->wc_flags = 0;
                        break;
                case MLX4_RECV_OPCODE_SEND_IMM:
                        wc->opcode      = IB_WC_RECV;
                        wc->wc_flags    = IB_WC_WITH_IMM;
                        wc->ex.imm_data = cqe->immed_rss_invalid;
                        break;
                }

                is_eth = (rdma_port_get_link_layer(wc->qp->device,
                                                  (*cur_qp)->port) ==
                          IB_LINK_LAYER_ETHERNET);
                if (mlx4_is_mfunc(to_mdev(cq->ibcq.device)->dev)) {
                        if ((*cur_qp)->mlx4_ib_qp_type &
                            (MLX4_IB_QPT_PROXY_SMI_OWNER |
                             MLX4_IB_QPT_PROXY_SMI | MLX4_IB_QPT_PROXY_GSI)) {
                                use_tunnel_data(*cur_qp, cq, wc, tail, cqe,
                                                is_eth);
                                return 0;
                        }
                }

                wc->slid           = be16_to_cpu(cqe->rlid);
                g_mlpath_rqpn      = be32_to_cpu(cqe->g_mlpath_rqpn);
                wc->src_qp         = g_mlpath_rqpn & 0xffffff;
                wc->dlid_path_bits = (g_mlpath_rqpn >> 24) & 0x7f;
                wc->wc_flags      |= g_mlpath_rqpn & 0x80000000 ? IB_WC_GRH : 0;
                wc->pkey_index     = be32_to_cpu(cqe->immed_rss_invalid) & 0x7f;
                wc->wc_flags      |= mlx4_ib_ipoib_csum_ok(cqe->status,
                                        cqe->checksum) ? IB_WC_IP_CSUM_OK : 0;
                if (is_eth) {
                        wc->sl  = be16_to_cpu(cqe->sl_vid) >> 13;
                        if (be32_to_cpu(cqe->vlan_my_qpn) &
                                        MLX4_CQE_CVLAN_PRESENT_MASK) {
                                wc->vlan_id = be16_to_cpu(cqe->sl_vid) &
                                        MLX4_CQE_VID_MASK;
                        } else {
                                wc->vlan_id = 0xffff;
                        }
                        memcpy(wc->smac, cqe->smac, ETH_ALEN);
                        wc->wc_flags |= (IB_WC_WITH_VLAN | IB_WC_WITH_SMAC);
                } else {
                        wc->sl  = be16_to_cpu(cqe->sl_vid) >> 12;
                        wc->vlan_id = 0xffff;
                }
        }

        return 0;
}

int mlx4_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
{
        struct mlx4_ib_cq *cq = to_mcq(ibcq);
        struct mlx4_ib_qp *cur_qp = NULL;
        unsigned long flags;
        int npolled;
        struct mlx4_ib_dev *mdev = to_mdev(cq->ibcq.device);

        spin_lock_irqsave(&cq->lock, flags);
        if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
                mlx4_ib_poll_sw_comp(cq, num_entries, wc, &npolled);
                goto out;
        }

        for (npolled = 0; npolled < num_entries; ++npolled) {
                if (mlx4_ib_poll_one(cq, &cur_qp, wc + npolled))
                        break;
        }

        mlx4_cq_set_ci(&cq->mcq);

out:
        spin_unlock_irqrestore(&cq->lock, flags);

        return npolled;
}

int mlx4_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
{
        mlx4_cq_arm(&to_mcq(ibcq)->mcq,
                    (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
                    MLX4_CQ_DB_REQ_NOT_SOL : MLX4_CQ_DB_REQ_NOT,
                    to_mdev(ibcq->device)->uar_map,
                    MLX4_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->uar_lock));

        return 0;
}

void __mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
{
        u32 prod_index;
        int nfreed = 0;
        struct mlx4_cqe *cqe, *dest;
        u8 owner_bit;
        int cqe_inc = cq->buf.entry_size == 64 ? 1 : 0;

        /*
         * First we need to find the current producer index, so we
         * know where to start cleaning from.  It doesn't matter if HW
         * adds new entries after this loop -- the QP we're worried
         * about is already in RESET, so the new entries won't come
         * from our QP and therefore don't need to be checked.
         */
        for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); ++prod_index)
                if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe)
                        break;

        /*
         * Now sweep backwards through the CQ, removing CQ entries
         * that match our QP by copying older entries on top of them.
         */
        while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) {
                cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
                cqe += cqe_inc;

                if ((be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK) == qpn) {
                        if (srq && !(cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK))
                                mlx4_ib_free_srq_wqe(srq, be16_to_cpu(cqe->wqe_index));
                        ++nfreed;
                } else if (nfreed) {
                        dest = get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe);
                        dest += cqe_inc;

                        owner_bit = dest->owner_sr_opcode & MLX4_CQE_OWNER_MASK;
                        memcpy(dest, cqe, sizeof *cqe);
                        dest->owner_sr_opcode = owner_bit |
                                (dest->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
                }
        }

        if (nfreed) {
                cq->mcq.cons_index += nfreed;
                /*
                 * Make sure update of buffer contents is done before
                 * updating consumer index.
                 */
                wmb();
                mlx4_cq_set_ci(&cq->mcq);
        }
}

void mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
{
        spin_lock_irq(&cq->lock);
        __mlx4_ib_cq_clean(cq, qpn, srq);
        spin_unlock_irq(&cq->lock);
}